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【单选题】
He was busy with his work but he went to see his grandmother________. [     ]
A.
sooner or later
B.
now and then
C.
more or less
D.
over and over again
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【单选题】Economists normally assume that the goal of a firm is to( ) (1) sell as much of their product as possible (2) set the price of their product as high as possible (3) maximize profit
A.
(1) and (2)
B.
(2) and (3)
C.
(3)only
D.
All of the above are correct.
【单选题】使用索氏提取器进行提取的方法
A.
连续回流提取法
B.
回流提取法
C.
煎煮法
D.
水蒸气蒸馏法
【多选题】抗日战争进入相持阶段是在 ( ) 。
A.
北平失陷以后
B.
南京失陷以后
C.
武汉失陷以后
D.
广州失陷以后
E.
上海失陷以后
【单选题】含有三个胚层组织成分的肿瘤叫做( )
A.
癌肉瘤
B.
混合瘤
C.
畸胎瘤
D.
错构瘤
E.
胚胎癌
【单选题】含有三个胚层组织成分的肿瘤叫做()。
A.
错构瘤
B.
间叶瘤
C.
畸胎瘤
D.
混合瘤
E.
迷离瘤
【多选题】使用索氏提取器进行固液提取,下列观点正确的有:
A.
利用了溶剂回流及虹吸原理,固体物质反复被纯溶剂浸润、萃取,效率较高
B.
无需拆解装置,相当于多次回流连续进行,方便快捷
C.
浸润的固体必需用滤纸等包裹起来,避免细小固体颗粒浮出,堵塞虹吸管
D.
滤纸筒中的固体不要高过虹吸管,否则萃取效果不理想
【单选题】Economists normally assume that the goal of a firm is to:
A.
sell as many units of output as possible.
B.
maximize profits.
C.
sell products at the highest prices possible.
D.
maximize sales revenue.
【单选题】Economists normally
A.
do not try to explain people's tastes, but they do try to explain what happens when tastes change.
B.
believe that they must be able to explain people's tastes in order to explain what happens when tastes change.
C.
do not believe that people's tastes determine demand, so they ignore the subject of tastes.
D.
incorporate tastes into economic models only to the extent that tastes determine whether pairs of goods are substitutes or complements.
【单选题】Economists normally assume that the goal of a firm is to
A.
maximize its total revenue.
B.
maximize its profit.
C.
minimize its explicit costs.
D.
minimize its total cost.
【单选题】Cheer up! Never let your failures _____ trying harder.
A.
put you through
B.
put you off
C.
put you across
D.
put you away
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